US8922119B2 - Flash lamp, a corresponding method of manufacture and apparatus for the same - Google Patents

Flash lamp, a corresponding method of manufacture and apparatus for the same Download PDF

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US8922119B2
US8922119B2 US13/503,944 US201013503944A US8922119B2 US 8922119 B2 US8922119 B2 US 8922119B2 US 201013503944 A US201013503944 A US 201013503944A US 8922119 B2 US8922119 B2 US 8922119B2
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conductive material
envelope
instance
electrode
isolated conductive
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US20120274205A1 (en
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John Littlechild
Martin Brown
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Excelitas Noblelight Ltd
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Heraeus Noblelight Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/20—Manufacture of screens on or from which an image or pattern is formed, picked up, converted or stored; Applying coatings to the vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/54—Igniting arrangements, e.g. promoting ionisation for starting
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/35—Vessels; Containers provided with coatings on the walls thereof; Selection of materials for the coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/54—Igniting arrangements, e.g. promoting ionisation for starting
    • H01J61/545—Igniting arrangements, e.g. promoting ionisation for starting using an auxiliary electrode inside the vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/84—Lamps with discharge constricted by high pressure
    • H01J61/90—Lamps suitable only for intermittent operation, e.g. flash lamp
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems

Definitions

  • This invention relates to a flash (or arc) lamp comprising an insulative envelope containing a gas and housing a pair of arcing electrodes; and to a corresponding method of manufacturing such a flash lamp and apparatus for the same.
  • the triggering process is complex and requires an initial breakdown or ionization in the lamp gas (e.g., xenon and krypton).
  • ionization in the lamp gas (e.g., xenon and krypton).
  • Most triggering schemes use a trigger transformer to produce the high voltage required to achieve the ionization.
  • Such ionization can typically be seen as a thin streamer between the two electrodes and forms the conductive path which allows a main energy storage capacitor to discharge across the electrodes, thus leading to an intense flash.
  • sputtering can be disadvantageous in that there can be a reduction in lifetime due to the sputtered material blocking light transmission from the plasma (leading to subsequent deglazing or recrystallization of the envelope material).
  • the sputtering process can damage the electrode surface and reduce the life of the lamp as the lamp plasma itself is used for the sputtering.
  • the sputtering process needs to be carried out during or prior to the gas filling of the lamp, which is normally a lengthy and unpredictable process. For example, it can be achieved by reverse polarity running the lamp at a low gas pressure.
  • a flash lamp comprising an insulative envelope containing a gas and housing a pair of arcing electrodes, characterized by an instance of isolated conductive material being formed at a predetermined location on the inside of the envelope adjacent an electrode. A plurality of such instances of isolated conductive material may also be formed.
  • the pseudorandom forming of such material by sputtering and the subsequent inconsistent triggering can be avoided if deliberate and controlled forming of such material is employed, i.e., forming the material at a predetermined location (as opposed to a pseudorandom location with sputtering) and/or forming the material in a predetermined shape (including in a geometric pattern).
  • At least one instance of isolated conductive material may be formed on the inside of the envelope in a region bounded by respective planes orthogonal to the direction of elongation and passing through the extremities of an electrode, especially, immediately adjacent the arcing end of that electrode.
  • a corresponding method of manufacturing a flash lamp comprising the step of providing an insulative envelope containing a gas housing a pair of arcing electrodes in the insulative envelope, characterized by the step of forming an instance of isolated conductive material at a predetermined location on the inside of the envelope adjacent an electrode.
  • such a method may employ localized heating (e.g., using a laser) of an area of an electrode to form at least one instance of isolated conductive material adjacent the heated area.
  • localized heating e.g., using a laser
  • an apparatus for manufacturing a flash lamp comprising a receptacle for receiving a flash lamp comprising an insulative envelope containing a gas and housing a pair of arcing electrodes; and a heat source (e.g., a laser) configured to heat a localized area of an electrode of the flash lamp in order to cause evaporated electrode material to form on the envelope, adjacent the heated area.
  • a heat source e.g., a laser
  • either the receptacle or the heat source is able to move relative to the other in order to determine the shape of the conductive material formed.
  • FIG. 1 shows, schematically, a flash lamp according to an embodiment of the present invention
  • FIG. 2 shows, schematically, the manufacture of the flash lamp of FIG. 1 .
  • a flash lamp having a quartz envelope 10 housing a lanthanated tungsten cathode 24 and an anode 18 connected to respective electrical connectors 20 , 22 .
  • the electrodes could equally have been tungsten, thoriated tungsten and many other metals or metal alloys.
  • the envelope 10 is optionally provided with two narrowing sections which approach the electrodes 18 , 24 to a distance of approximately 15 to 20 microns and which provide for cooling of the electrodes in use.
  • a conductive deposit 28 is formed adjacent the electrode tip 26 .
  • a laser is provided, controlled by a corresponding control unit, for locally heating a small area of the tungsten cathode 24 in order to evaporate electrode material for subsequent deposition on the quartz envelope 10 .
  • the shape of the conductive deposit can be defined by the movement of the laser relative to the lamp to get a desired effect.
  • Table 1 summarizes the results of experiments conducted on twelve batches of flash lamps. Without a conductive deposit, the required trigger voltage is high (up to 10 kV) and somewhat inconsistent between batches. However, after forming the conductive deposits in accordance with the present invention, it is evident that the triggering voltage is both much reduced and consistent.
  • direct heat sources and indirect heat sources could be used to form a shaped deposit of conductive material (especially where a small exposed structure is provided so as to be particularly susceptible to inductive heating, e.g., a small structure of tungsten on top of the electrode to be “heated away”).
  • the conductive deposit can be formed during lamp manufacture, e.g., before filling with gas, or when the lamp is otherwise fully formed.
  • the conductive deposit is formed from electrode material, but it could be from another material (or different alloy grade) during lamp manufacture. For example, one may first form an instance of isolated conductive material at a predetermined location on the electrode and then heat that instance of isolated conductive material on the electrode, e.g., by baking, to cause it to evaporate and condense on the adjacent envelope. A sol-gel type process to achieve a similar effect could also be used.
  • the above embodiment describes an anode and cathode arrangement, i.e., DC, with the conductive deposit adjacent the cathode.
  • the conductive deposit or additional conductive deposits could also be adjacent the anode.
  • the above is also applicable to AC lamps having electrodes (i.e., not an anode and cathode per se).

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Discharge Lamp (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

A flash lamp is disclosed including an insulative envelope containing a gas and housing a pair of arcing electrodes and characterized by an instance of isolated conductive material being formed at a predetermined location on the inside of the envelope adjacent an electrode. Further disclosed is a corresponding method of manufacturing a flash lamp and apparatus for the same.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a Section 371 of International Application No. PCT/EP2010/006630, filed Oct. 29, 2010, which was published in the English language on May 26, 2011, under International Publication No. WO 2011/060878 A1 and the disclosure of which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
This invention relates to a flash (or arc) lamp comprising an insulative envelope containing a gas and housing a pair of arcing electrodes; and to a corresponding method of manufacturing such a flash lamp and apparatus for the same.
As is known, the ignition/triggering properties of arc and flash lamps are notoriously inconsistent from one batch of lamps to another and from one lamp to another.
The triggering process is complex and requires an initial breakdown or ionization in the lamp gas (e.g., xenon and krypton). Most triggering schemes use a trigger transformer to produce the high voltage required to achieve the ionization. Such ionization can typically be seen as a thin streamer between the two electrodes and forms the conductive path which allows a main energy storage capacitor to discharge across the electrodes, thus leading to an intense flash.
To improve the triggering process, it is known to sputter part of the electrode material on to the inner surface of the envelope near to the electrode. As a consequence, the voltage required to ignite a lamp can be significantly lowered.
However, such sputtering can be disadvantageous in that there can be a reduction in lifetime due to the sputtered material blocking light transmission from the plasma (leading to subsequent deglazing or recrystallization of the envelope material). Also, the sputtering process can damage the electrode surface and reduce the life of the lamp as the lamp plasma itself is used for the sputtering. Furthermore, the sputtering process needs to be carried out during or prior to the gas filling of the lamp, which is normally a lengthy and unpredictable process. For example, it can be achieved by reverse polarity running the lamp at a low gas pressure.
BRIEF SUMMARY OF THE INVENTION
In accordance with a first aspect of the present invention, there is provided a flash lamp comprising an insulative envelope containing a gas and housing a pair of arcing electrodes, characterized by an instance of isolated conductive material being formed at a predetermined location on the inside of the envelope adjacent an electrode. A plurality of such instances of isolated conductive material may also be formed.
The pseudorandom forming of such material by sputtering and the subsequent inconsistent triggering can be avoided if deliberate and controlled forming of such material is employed, i.e., forming the material at a predetermined location (as opposed to a pseudorandom location with sputtering) and/or forming the material in a predetermined shape (including in a geometric pattern).
In embodiments where the envelope is elongate, it may be preferable for at least one instance of isolated conductive material to be formed on the inside of the envelope in a region bounded by respective planes orthogonal to the direction of elongation and passing through the extremities of an electrode, especially, immediately adjacent the arcing end of that electrode.
In accordance with a second aspect of the present invention, there is provided a corresponding method of manufacturing a flash lamp comprising the step of providing an insulative envelope containing a gas housing a pair of arcing electrodes in the insulative envelope, characterized by the step of forming an instance of isolated conductive material at a predetermined location on the inside of the envelope adjacent an electrode.
In particular, such a method may employ localized heating (e.g., using a laser) of an area of an electrode to form at least one instance of isolated conductive material adjacent the heated area. Using such a technique, it is possible to the shape of the conductive material by movement of the external heat source relative to an electrode.
In accordance with a third aspect of the present invention, there is provided an apparatus for manufacturing a flash lamp comprising a receptacle for receiving a flash lamp comprising an insulative envelope containing a gas and housing a pair of arcing electrodes; and a heat source (e.g., a laser) configured to heat a localized area of an electrode of the flash lamp in order to cause evaporated electrode material to form on the envelope, adjacent the heated area.
Ideally, either the receptacle or the heat source is able to move relative to the other in order to determine the shape of the conductive material formed.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
The foregoing summary, as well as the following detailed description of the invention, will be better understood when read in conjunction with the appended drawings. For the purpose of illustrating the invention, there are shown in the drawings embodiments which are presently preferred. It should be understood, however, that the invention is not limited to the precise arrangements and instrumentalities shown.
In the drawings:
FIG. 1 shows, schematically, a flash lamp according to an embodiment of the present invention; and
FIG. 2 shows, schematically, the manufacture of the flash lamp of FIG. 1.
 DETAILED DESCRIPTION OF THE INVENTION
Referring to FIG. 1, a flash lamp is shown having a quartz envelope 10 housing a lanthanated tungsten cathode 24 and an anode 18 connected to respective electrical connectors 20, 22. The electrodes could equally have been tungsten, thoriated tungsten and many other metals or metal alloys. The envelope 10 is optionally provided with two narrowing sections which approach the electrodes 18, 24 to a distance of approximately 15 to 20 microns and which provide for cooling of the electrodes in use.
In accordance with the present invention and to improve the triggering process, a conductive deposit 28 is formed adjacent the electrode tip 26.
Referring to FIG. 2, a method of manufacture of such a lamp is illustrated. A laser is provided, controlled by a corresponding control unit, for locally heating a small area of the tungsten cathode 24 in order to evaporate electrode material for subsequent deposition on the quartz envelope 10. Although not shown, the shape of the conductive deposit can be defined by the movement of the laser relative to the lamp to get a desired effect.
Table 1 below summarizes the results of experiments conducted on twelve batches of flash lamps. Without a conductive deposit, the required trigger voltage is high (up to 10 kV) and somewhat inconsistent between batches. However, after forming the conductive deposits in accordance with the present invention, it is evident that the triggering voltage is both much reduced and consistent.
TABLE 1
Experimental Results
Trigger Trigger Trigger Trigger
Batch [kV] [kV] [kV] [kV] Change
No. before 1st attempt 2nd attempt avg. (%)
 41/13. 10.00 2.25 2.25 2.25 −78
42/20 7.00 3.25 3.00 3.13 −55
42/25 7.00 2.25 2.25 2.25 −68
43/10 11.00 4.00 3.50 3.75 −66
43/11 9.75 3.25 3.25 3.25 −67
43/25 10.00 3.00 2.30 2.65 −74
44/29 6.25 4.00 3.25 3.63 −42
44/31 6.50 4.00 3.00 3.50 −46
46/29 8.50 4.00 3.00 3.50 −59
47/21 11.00 4.50 4.00 4.25 −61
47/24 7.50 3.00 3.00 3.00 −60
47/25 10.00 4.50 3.00 3.75 −63
Whilst the above embodiment describes direct heating by a laser, it will be appreciated that other direct heat sources and indirect heat sources (such as by high frequency inductive heating) could be used to form a shaped deposit of conductive material (especially where a small exposed structure is provided so as to be particularly susceptible to inductive heating, e.g., a small structure of tungsten on top of the electrode to be “heated away”).
Furthermore, the conductive deposit can be formed during lamp manufacture, e.g., before filling with gas, or when the lamp is otherwise fully formed. Also, in the embodiment, the conductive deposit is formed from electrode material, but it could be from another material (or different alloy grade) during lamp manufacture. For example, one may first form an instance of isolated conductive material at a predetermined location on the electrode and then heat that instance of isolated conductive material on the electrode, e.g., by baking, to cause it to evaporate and condense on the adjacent envelope. A sol-gel type process to achieve a similar effect could also be used.
The above embodiment describes an anode and cathode arrangement, i.e., DC, with the conductive deposit adjacent the cathode. The conductive deposit or additional conductive deposits could also be adjacent the anode. Similarly, the above is also applicable to AC lamps having electrodes (i.e., not an anode and cathode per se).
Other variations on the above embodiments would also suggest themselves to those skilled in the art.
It will be appreciated by those skilled in the art that changes could be made to the embodiments described above without departing from the broad inventive concept thereof. It is understood, therefore, that this invention is not limited to the particular embodiments disclosed, but it is intended to cover modifications within the spirit and scope of the present invention as defined by the appended claims.

Claims (14)

We claim:
1. A flash lamp comprising an insulative envelope containing a gas and housing a pair of arcing electrodes, each electrode having a tip, wherein each electrode and its tip are made from a conductive material, wherein at least one instance of isolated conductive material is formed at a predetermined location on the inside of the envelope adjacent one of the electrodes, and wherein the isolated conductive material is formed from evaporated material of the conductive material of the electrode.
2. The flash lamp according to claim 1 wherein a plurality of instances of isolated conductive material are formed at predetermined locations on the inside of the envelope adjacent one of the electrodes.
3. The flash lamp according to claim 1 wherein the envelope is elongate, and wherein the at least one instance of isolated conductive material is formed on the inside of the envelope in a region bounded by respective planes orthogonal to the direction of elongation and passing through the extremities of one of the electrodes.
4. The flash lamp according to claim 3 wherein the envelope is elongate, and wherein the at least one instance of isolated conductive material is immediately adjacent the arcing end of the electrode to which the at least one instance of isolated conductive material is adjacent.
5. The flash lamp according to claim 1 wherein the at least one instance of isolated conductive material formed on the inside of the envelope has a predetermined shape.
6. The flash lamp according to claim 1 wherein the at least one instance of isolated conductive material formed on the inside of the envelope has a geometric shape.
7. A method of manufacturing a flash lamp comprising:
providing an insulative envelope containing a gas housing a pair of arcing electrodes in the insulative envelope, each electrode having a tip, wherein each electrode and its tip are made from a conductive material, and
forming at least one instance of isolated conductive material at a predetermined location on the inside of the envelope adjacent one of the electrodes,
wherein the at least one instance of isolated conductive material is formed by localized heating of an area of one of the electrodes from an external heat source whereby evaporated material of the conductive material of the electrode forms on the envelope, adjacent the heated area.
8. The method according to claim 7 wherein a plurality of instances of isolated conductive material are formed at predetermined locations on the inside of the envelope adjacent one of the electrodes.
9. The method according to claim 7 wherein the envelope is elongate, and wherein the at least one instance of isolated conductive material is formed on the inside of the envelope in a region bounded by respective planes orthogonal to the direction of elongation and passing through the extremities of one of the electrodes.
10. The method according to claim 9 wherein the at least one instance of isolated conductive material is immediately adjacent the arcing end of the electrode to which the at least one instance of isolated conductive material is adjacent.
11. The method according to claim 7 wherein the at least one instance of isolated conductive material formed on the inside of the envelope has a predetermined shape.
12. The method according to claim 7 wherein the at least one instance of isolated conductive material formed on the inside of the envelope has a geometric shape.
13. The method according to claim 7 wherein the shape of the conductive material is determined by movement of the external heat source relative to the electrode being heated.
14. The method according to claim 7 wherein the external heat source is a laser.
US13/503,944 2009-11-23 2010-10-29 Flash lamp, a corresponding method of manufacture and apparatus for the same Active 2031-07-03 US8922119B2 (en)

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GB0920440.5A GB2475536B (en) 2009-11-23 2009-11-23 A flash lamp, a corresponding method of manufacture and apparatus for the same
PCT/EP2010/006630 WO2011060878A1 (en) 2009-11-23 2010-10-29 A flash lamp, a corresponding method of manufacture and apparatus for the same

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US3829732A (en) * 1971-10-11 1974-08-13 J Basov Gas-dynamic discharge light
JPS57202057A (en) * 1981-06-05 1982-12-10 Ricoh Co Ltd Flash discharge lamp
JPS58225553A (en) 1982-06-24 1983-12-27 Nec Corp Discharge lamp
JPS59148229A (en) * 1983-02-15 1984-08-24 Ushio Inc Manufacture of flash discharge lamp
JPH09320533A (en) 1996-05-29 1997-12-12 West Electric Co Ltd Fluorescent discharge tube
JP2001076617A (en) 1999-08-31 2001-03-23 Hitachi Ltd Discharge tube and liquid crystal display device using discharge tube as illumination light source
WO2002095792A1 (en) 2001-05-17 2002-11-28 Matsushita Electric Industrial Co., Ltd. Cold cathode discharge lamp and method of manufacturing the discharge lamp
JP2003036813A (en) 2001-05-17 2003-02-07 Matsushita Electric Ind Co Ltd Cold cathode lamp and its manufacturing method
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US2316344A (en) * 1942-01-21 1943-04-13 Gen Electric Flash lamp
FR1409650A (en) * 1964-09-25 1965-08-27 Thomson Houston Comp Francaise Improvements to light sources
US3829732A (en) * 1971-10-11 1974-08-13 J Basov Gas-dynamic discharge light
JPS57202057A (en) * 1981-06-05 1982-12-10 Ricoh Co Ltd Flash discharge lamp
JPS58225553A (en) 1982-06-24 1983-12-27 Nec Corp Discharge lamp
JPS59148229A (en) * 1983-02-15 1984-08-24 Ushio Inc Manufacture of flash discharge lamp
JPH09320533A (en) 1996-05-29 1997-12-12 West Electric Co Ltd Fluorescent discharge tube
JP2001076617A (en) 1999-08-31 2001-03-23 Hitachi Ltd Discharge tube and liquid crystal display device using discharge tube as illumination light source
WO2002095792A1 (en) 2001-05-17 2002-11-28 Matsushita Electric Industrial Co., Ltd. Cold cathode discharge lamp and method of manufacturing the discharge lamp
JP2003036813A (en) 2001-05-17 2003-02-07 Matsushita Electric Ind Co Ltd Cold cathode lamp and its manufacturing method
US20060192490A1 (en) * 2003-03-10 2006-08-31 Yuichiro Ogino Production method of discharge lamp

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Title
Int'l Search Report issued Feb. 2, 2011 in Int'l Application No. PCT/EP2010/006630.
Search Report issued Feb. 19, 2010 in GB Application No. GB0920440.5.

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US20150072584A1 (en) 2015-03-12
CN102612732A (en) 2012-07-25
WO2011060878A1 (en) 2011-05-26
GB2475536A (en) 2011-05-25
EP2504853B1 (en) 2015-12-16
US9177747B2 (en) 2015-11-03
GB0920440D0 (en) 2010-01-06
EP2504853A1 (en) 2012-10-03
US20120274205A1 (en) 2012-11-01

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